Status: New
Owner:
Labels: Type-Defect Priority-Medium
New issue 158 by marcolslaviero: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
What steps will reproduce the problem?
1. Download attached script
2. Start a memcached server on a UDP port
3. Ru
Comment #1 on issue 158 by marcolslaviero: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
I omitted to mention that once the UDP channel stops responding, the
memcached process consumes 100% cpu; in this way the bug indirectly affects
users of the TC
Updates:
Owner: eric.d.lambert
Comment #2 on issue 158 by eric.d.lambert: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
(No comment was entered for this change.)
Comment #3 on issue 158 by eric.d.lambert: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
Just FYI, was not able to reproduce this on mac using 1.4.5 with libevent
2.07-rc ... will take a look on linux when I get a chance.
smacky:Downloads elambert$
Comment #4 on issue 158 by marcolslaviero: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
Thanks for the feedback, apologies for supplying a PoC that didn't demo the
issue sufficiently, that was pretty fail for a PoC. However, I believe the
bug to st
Comment #5 on issue 158 by eric.d.lambert: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
I think i have somewhat of an idea as to what is happening. The UDP
connections behave a little bit different than TCP. At start up, the server
creates a UDP "c
Updates:
Status: Accepted
Comment #6 on issue 158 by eric.d.lambert: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
(No comment was entered for this change.)
Comment #7 on issue 158 by marcolslaviero: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
Well spotted, I was indeed running the initial tests with -t 1. At least
that clears up some minor confusion this side.
Comment #8 on issue 158 by airat.halimov: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
possible the same cause as for:
http://code.google.com/p/memcached/issues/detail?id=106
Comment #9 on issue 158 by airat.halimov: Single packet DoS on UDP channel
http://code.google.com/p/memcached/issues/detail?id=158
if you end up the message with "\r\n" - you won't be able to reproduce the
bug.
Yeah, the problem is due to how the server deals with a "large" (over
1024 bytes IIRC) malformed UDP messages (in this case malformed means
no \r\n). I've had a fix for a while, just have not gotten around to
getting a unit-test written and checking in the fix.
On Dec 14, 7:20 am, memcac...@google
Updates:
Status: Fixed
Comment #10 on issue 158 by dorma...@rydia.net: Single packet DoS on UDP
channel
http://code.google.com/p/memcached/issues/detail?id=158
The patch for 1.4.7 related to #106 fixes this guy too.
Going to close out this bug and leave any further discussion on the
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